Here's my SPD workflow:
1) create item in Project Artifact Library (output to ID_of_PAL_item_created) 2) set Variable: PAL_ID to "ID_of_PAL_item_created" 3) Calculate PAL_ID plus 1 (Output to Variable: CalcPALID) 4) Set PAL_ID to Variable CalcPALID
at step 4, this is where it throws the error.
The type is either Integer or Number (tried both ways) on the 2 variables PAL_ID and CalcPALID.
i had to convert it so i could use the calculate method. otherwise it just appended a "1" to the end of my ID_of_PAL_item_created variable!!! dumb.